I have an Alienware m14x r2 with windows 7 64bits, some time ago the speaker stopped working but i fixed it, then the headphone stopped working and i fixed it again, but 1 or 2 months ago i was using my old headphone and the left ear stopped working, i tough that the headphone was broken and i bought a new one, but still no sound on the left side, some computers in my school have the same problem on the left side so it might be a common problem with windows 7 or someting
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